factorise : 1 - 1/x , using identity a2 - b2 = ( a+b) ( a-b)
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1 - 1/x
(1)² - (1/√x)²
(1+1√x) (1-1/√x)
(1)² - (1/√x)²
(1+1√x) (1-1/√x)
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